gRPC REST | ### MutateExperimentArms | |---| | `` rpc MutateExperimentArms(`https://developers.google.com/google-ads/api/reference/rpc/v26/MutateExperimentArmsRequest`) returns (`https://developers.google.com/google-ads/api/reference/rpc/v26/MutateExperimentArmsResponse`) `` Creates, updates, or removes experiment arms. Operation statuses are returned. List of thrown errors: [AuthenticationError](https://developers.google.com/google-ads/api/reference/rpc/v26/AuthenticationErrorEnum.AuthenticationError) [AuthorizationError](https://developers.google.com/google-ads/api/reference/rpc/v26/AuthorizationErrorEnum.AuthorizationError) [ExperimentArmError](https://developers.google.com/google-ads/api/reference/rpc/v26/ExperimentArmErrorEnum.ExperimentArmError) [HeaderError](https://developers.google.com/google-ads/api/reference/rpc/v26/HeaderErrorEnum.HeaderError) [InternalError](https://developers.google.com/google-ads/api/reference/rpc/v26/InternalErrorEnum.InternalError) [QuotaError](https://developers.google.com/google-ads/api/reference/rpc/v26/QuotaErrorEnum.QuotaError) [RequestError](https://developers.google.com/google-ads/api/reference/rpc/v26/RequestErrorEnum.RequestError) | Authorization scopes : Requires the following OAuth scope: - `https://www.googleapis.com/auth/adwords` For more information, see the [OAuth 2.0 Overview](https://developers.google.com/identity/protocols/OAuth2).